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Laboratory simulation of cometary processes

Grün, E. and Bar-Nun, A. and Benkhoff, J. and Bischoff, A. and Düren, H. and Hellmann, H. and Hesselbarth, P. and Hsiung, P. and Keller, H. U. and Klinger, J.) and Knölker, J. and Kochan, H. and Kohl, H. and Kölzer, G. and Krankowsky, D. and Lämmerzahl, P. and Mauersberger, K. and Neukum, G. and Oehler, A. and Ratke, L. and Roessler, K. and Schwehm, G. and Spohn, T. and Stöffler, D. and Thiel, K. (1991) Laboratory simulation of cometary processes. In: Comets in the Post-Halley Era Kluwer Academic Publishers. pp. 277-297.

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In situ observations of comet Halley provided the first photographs of a cometary nucleus and yielded information about its environment, including the emitted gas and dust. The relation between these measurements and properties of and processes on the nucleus is established by theoretical modelling, while laboratory experiments may provide some of the physical parameters needed. In addition, laboratory tests can stimulatenew ideas for processes that may be relevant to cometary physics. Processes to be studied in detail by large-scale laboratory experiments may include: (1) heat transport phenomena during sublimation of porous ice-dust mixtures, (2) material modification and chemical fractionation caused by the sublimation processes, (3)buildup and destruction of dust mantles, (4) detailed studies of gas release from mixtures of volatile ices, and (5) the investigation of ice and dust particle release mechanism. The KOSI-team (Kometensimulation) carried out sublima- tion experiments with ice-mineral mixtures in a large Space Simu- lator. During initial experiments, cylindrical samples of 30-cm diameter and 15-cm thickness were irradiated with up to 2700-W/m2 light energy. The samples constited of water-ice or water- and CO2-ice mineral mixtures. The experiments showed the importance of advection for heat transport into the interior. It was found that the sublimation of CO2 advances into the sample at a higher speed than that of water vapor release. Therefore, emission of volatile gases responded to insolation changes with a time lag of several hours. The ratio of the emitted gas species, as well as the dust- to-gas ratio, differs significantly from the values within the sample. A partly permeable refractory mantle of minerals and carbonaceous material developed with time. Dust and ice particle emission has been observed to occur from irradiated dirty ices as well as from dust mantles.

Item URL in elib:https://elib.dlr.de/34521/
Document Type:Book Section
Additional Information: LIDO-Berichtsjahr=1991,
Title:Laboratory simulation of cometary processes
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Grün, E.MPI für Kernphysik, HeidelbergUNSPECIFIEDUNSPECIFIED
Bar-Nun, A.Dept. of Geophysics and Planetary Sciences, Tel Aviv University, IsraelUNSPECIFIEDUNSPECIFIED
Benkhoff, J.Institut für Planetologie, Univ. MünsterUNSPECIFIEDUNSPECIFIED
Bischoff, A.Institut für Planetologie, Univ. MünsterUNSPECIFIEDUNSPECIFIED
Düren, H.Institut für Planetologie, Univ. MünsterUNSPECIFIEDUNSPECIFIED
Hesselbarth, P.MPI für Kernphysik, HeidelbergUNSPECIFIEDUNSPECIFIED
Hsiung, P.Institut für Chemie I, KFA JülichUNSPECIFIEDUNSPECIFIED
Keller, H. U.MPI für Aeronomie, Katlenburg-LindauUNSPECIFIEDUNSPECIFIED
Klinger, J.)Laboratoire de Glaciologie et Géophysique de l'Environnement, Saint-Martin-d'Heres, FranceUNSPECIFIEDUNSPECIFIED
Knölker, J.Institut für Planetologie, Univ. MünsterUNSPECIFIEDUNSPECIFIED
Kohl, H.MPI für Kernphysik, HeidelbergUNSPECIFIEDUNSPECIFIED
Kölzer, G.Abt. Nuklearchemie, Universität zu KölnUNSPECIFIEDUNSPECIFIED
Krankowsky, D.MPI für Kernphysik, HeidelbergUNSPECIFIEDUNSPECIFIED
Lämmerzahl, P.MPI für Kernphysik, HeidelbergUNSPECIFIEDUNSPECIFIED
Mauersberger, K.MPI für Kernphysik, HeidelbergUNSPECIFIEDUNSPECIFIED
Roessler, K.Institut für Chemie I, KFA JülichUNSPECIFIEDUNSPECIFIED
Schwehm, G.Space Science Department of ESA, ESTECUNSPECIFIEDUNSPECIFIED
Spohn, T.Institut für Planetologie, Univ. MünsterUNSPECIFIEDUNSPECIFIED
Stöffler, D.Institut für Planetologie, Univ. MünsterUNSPECIFIEDUNSPECIFIED
Thiel, K.Abt. Nuklearchemie, Universität zu KölnUNSPECIFIEDUNSPECIFIED
Journal or Publication Title:Comets in the Post-Halley Era
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 277-297
EditorsEmailEditor's ORCID iDORCID Put Code
Publisher:Kluwer Academic Publishers
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Space
DLR - Program:no assignment
DLR - Research theme (Project):UNSPECIFIED
Location: Oberpfaffenhofen
Institutes and Institutions:Institut für Optoelektronik
Deposited By: DLR-Beauftragter, elib
Deposited On:02 Apr 2006
Last Modified:27 Apr 2009 09:34

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